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https://issues.apache.org/jira/browse/SPARK-2245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14041244#comment-14041244
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Reynold Xin commented on SPARK-2245:
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[~ankurd]
> VertexRDD can not be materialized for checkpointing
> ---------------------------------------------------
>
> Key: SPARK-2245
> URL: https://issues.apache.org/jira/browse/SPARK-2245
> Project: Spark
> Issue Type: Bug
> Components: GraphX
> Reporter: Baoxu Shi
>
> Seems one can not materialize VertexRDD by simply calling count method, which
> is overridden by VertexRDD. But if you call RDD's count, it could materialize
> it.
> Is this a feature that designed to get the count without materialize
> VertexRDD? If so, do you guys think it is necessary to add a materialize
> method to VertexRDD?
> By the way, does count() is the cheapest way to materialize a RDD? Or it just
> cost the same resources like other actions?
> The pull request is here:
> https://github.com/apache/spark/pull/1177
> Best,
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